Introduction to Commonly Used Paper Types for Disposable Paper Cups

In the production of disposable paper cups, paper selection is a crucial step. Different paper structures, basis weights, and surface treatments directly affect the stiffness, leak-proof performance, applicable scenarios, and process requirements of the paper cup manufacturing machine.

From a paper cup manufacturing perspective, we will systematically introduce several of the most commonly used paper types for disposable paper cups, helping you gain a basic understanding of the fundamental differences in raw materials used in paper cup production.

I. Basic Structure of Paper Cups

Common disposable paper cups on the market are usually not "pure paper," but consist of the following two parts:
    Base paper: Generally food-grade virgin wood pulp paper, providing strength and a foundation for cup forming.
    Surface coating: Through PE or other coating materials, it serves to prevent water and leakage.

Depending on the coating structure and the differences in the paper itself, paper cups can be further subdivided into various types.

II. Single PE Coated Paper

1. Structural Characteristics
Single PE coated paper refers to paper with a single layer of PE (polyethylene) film coated on one side:
    Outer side: Base paper (printable)
    Inner side: Single-layer PE coating (in contact with liquid)

2. Common Grammage Range
150–350 gsm (paper gramm) + 15-18 gsm (PE coating gramm)
Adjusted according to cup type and capacity

3. Applicable Paper Cup Types
Hot beverage cups (coffee cups, tea cups)
Room temperature beverage cups
Tasting cups, small-capacity paper cups

4. Requirements for Paper Cup Machines
Copper heating or ultrasonic heating for PE layer fusion
Suitable for most standard paper cup machines

Single PE coated paper is currently the most widely used and mature type of paper for paper cups.

III. Double PE Coated Paper

1. Structural Features
Double PE coated paper consists of two layers of PE coated on both sides of the base paper:
    Outer side: PE coating
    Inner side: PE coating

2. Common Basis Weight Range
15-18 gsm (PE coating basis weight) + 180–350 gsm (paper basis weight) + 15-18 gsm (PE coating basis weight)
Adjusted according to cup type and capacity

3. Applicable Paper Cup Types
Cold drink cups
Iced juice cups
Iced water cups
Paper cups for high humidity environments

4. Reasons for Using Double PE
Prevents condensation from penetrating the paper
Reduces softening of the cup wall due to water absorption
Improves the stability of the paper cup in low temperature and high humidity environments

5. Impact on Paper Cup Machines
Higher requirements for heating system stability

Different forming pressure and temperature parameters compared to single PE paper

Double PE coated paper is typically used for paper cups specifically for cold drinks and iced beverages.

IV. Kraft Paper

1. Paper Characteristics
Kraft paper, with its natural color and high fiber strength, is widely used for coffee cups and takeaway beverage packaging:
    Yellowish or brownish color
    Long fibers, good stiffness
    More environmentally friendly and natural appearance

2. Common Structures
Single PE coated kraft paper
Double PE coated kraft paper (for cold drinks)

3. Common Applications
Coffee paper cups
Takeaway hot drink cups
Double-walled inner cups

4. Equipment Requirements
High precision mold requirements

Requires a more stable cup edge rolling and sealing system

Kraft paper is often used for paper cup products that emphasize brand image and aesthetic texture.

V. Double Wall Cup Paper

Double wall cups are not made of a single type of paper, but rather a combination of two paper structures:

1. Inner Cup Paper
Typically single-layer PE white cardboard/kraft paper
Directly in contact with liquid

2. Outer Cup Paper (Cup Sleeve Paper)
Uncoated or lightly coated paper
Focusing more on stiffness and surface printing effects

3. Impact on Production Line

Requires a paper cup machine + cup sleeve machine for in-line production

The double wall cup structure places higher demands on paper matching and equipment compatibility.

VI. The Relationship Between Paper Selection and Paper Cup Manufacturing Machines

From a production perspective, different paper types directly affect:

    forming temperature and pressure settings; 

    mold design and dimensional accuracy;

    bottom knurling and side sealing stability; 

    and equipment operating speed and yield.

Therefore, when selecting paper for paper cups, it is usually necessary to consider the type of paper cup, the usage scenario, and the technical parameters of the paper cup manufacturing machine.